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Fiat Panda Key Fob Replacement Fiat Panda keyfobs are equipped with a transponder that sends a signal from the fob to the car that allows it to unlock doors or start the motor. The fob may stop working for a variety. The most frequent cause of key fob failure is a dead coin battery. Other causes include water damage, a faulty receiver module, and signal interference. Dead Coin Battery Replace the battery if the key fob is dead. Use a button cell with the same voltage, size and specifications as your previous one. If the key fob was exposed to water (such as rain or saltwater at the beach), it must be cleaned prior to using it again. A paper towel soaked in alcohol or electronic cleaner will be the solution. If the key fob doesn't working despite being not exposed to water, it could be due to a glitch in the receiver module, or even in the internal electronic chip. In these cases it is possible that reprogramming the key fob with an OBDII scanner can help. Water Damage You might have water damage to your key fob if it was submerged in a puddle, pool or washing machine. It's possible to get it working by taking the batteries off and cleaning the circuit board using ruby alcohol. It is best to let the board completely dry prior to installing the battery. If your key fob stopped working, even after replacing the battery and programming it again, you might have a faulty receiver module. You can find instructions for reprogramming most vehicles' remote keys on YouTube or refer to your owner's manual. You can also reset your car's computer using the OBDII scanner tool. Faulty Receiver Module The key fob contains a chip that communicates with the vehicle's system. The chip will stop sending and receiving signals to the car if damaged. This could be due to dropping the key fob, or by exposure to water. If spare key fiat 500 stopped working after exposure to water it may be possible to fix it by cleaning the chip with isopropyl alcohol, or electronic cleaner. If the key fob does not respond to cleaning, it is possible that the receiver module has an issue and should be replaced. A malfunctioning receiver could cause the key to stop working. This is typically caused by electromagnetic interference. A malfunctioning electronic chip The electronic chip in your key fob is an important element of the anti-theft device in your car. It transmits a signal to the immobiliser unit in your car to determine whether the key is in fact valid. If the chip is damaged or broken, your vehicle won't start. A damaged chip could be caused by interference from other objects, weather conditions or transmitters close to your vehicle. In this instance, you will need a new key fob. Faulty Battery Contacts The battery contacts in a key fob are very delicate and may be damaged through repeated use. If they are damaged or bent, the key fob will not transmit any signals to the receiver modules inside the car. Modern fobs are designed with rubber seals that keep out water. Immersing them in water, even if it is just the slightest splash or drizzle, can damage the chip's electronic components. The key fob contains an embedded chip that communicates to the immobilizer system of the vehicle, allowing it to start it. This system utilizes cryptocoding systems in newer vehicles, or the old red key system used in older ones. The chip must be replaced if defective. Faulty 12 Volt Battery A faulty battery may cause the key fob to work. If this happens the car's computer will not recognize that the remote is inside the vehicle. Before you replace the battery, test it by using a the voltmeter to determine its capacity. A fully charged battery will read 12.6 volts. If the reading falls significantly then it's time to replace the battery. To test a battery's capacity put an electrical load on it for a couple of minutes. This will eliminate one percent of the surface charges. After that, take the voltage once more. The better the battery's capacity is, the longer it will keep its voltage. It is ideal to maintain close to 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the most typical cause of a key fob that ceases to send signals to the car. This problem can be solved by replacing the battery. However, it is important to choose a battery that has the same voltage and size as the original. Fobs aren't impervious to damage and can take a lot. The battery buttons and contacts are brittle and are susceptible to being bent or broken by rough usage. Other transmitters or objects that use the same frequency could also interfere with a signal. A light-control system in your home, for instance could interfere with key fobs using the same bandwidth. This could interfere with the remote control of your car. The tool is not working properly. OBDII scan tool There are a number of reasons why a scanner could not function. Some are more complex than others. Professional scan tools enable mechanics to observe the car's network and run various self-tests. These are great time-savers, but they can be expensive, out of the range of most DIYers. If your OBD2 scanner doesn't work Check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If both are in good condition it's possible that a fuse has failed. This is the most frequent reason for failure of the scan tool. It is usually easy to fix the problem by replacing the fuse that was blown.